Fail-secure and fail-safe door lock mechanism

Abstract

An electrical door lock device for alternate fail-secure and fail-safe operation comprising an elongated housing for mounting in a door or frame member, a bolt slidably mounted in the housing for movement between a first position and a second position with the first position being a projected locking position and the second position being a retracted nonlocking position, an actuator plate for driving the bolt between the first and second positions with the plate being movably mounted within the housing for movement between first and second positions and operationally connected to the bolt for driving the bolt to one of the first and second positions upon movement of the plate from the first position to the second position and for driving the bolt to the other of the first and second positions upon movement of the plate from the second position to the first position, a solenoid assembly for electrically actuating the plate from the first position to the second position, and a spring for normally biasing the plate toward the first position.

I claim: 
     
       1. An electric door lock device comprising, an elongated housing for mounting in a door or frame member,   a bolt slideably mounted in said housing for movement between a first position and a second position, said first position being a projected, locking position and said second position being a retracted, nonlocking position,   actuator plate means for actuating said bolt between said first and second positions, said plate means being movably mounted in said housing for movement between first and second positions   a solenoid means for electrically actuating said plate means from said first position to said second position,   spring means for normally biasing said plate means toward said first position, and   means for operationally interconnecting said bolt to said plate means for driving said bolt between said first and second positions responsive to movement of said plate means between said first and second positions, said interconnecting means including means for moving said bolt to said first position upon movement of said plate means to said first position and for moving said bolt to said second position upon movement of said plate means to said second position to provide a fail-secure operational mode and means for moving said bolt to said second position upon movement of said plate means to said first position and for moving said bolt to said first position upon movement of said plate means to said second position to provide a fail-safe operational mode,   said bolt being operationally interconnnected to said plate means for driving said bolt to one of said first and second positions upon movement of said plate means from said first position to said second position and for driving said bolt to the other of said first and second positions upon movement of said plate means from said second position to said first position.   
     
     
       2. The device of claim 1 wherein said actuator plate means comprises means for deadlatching said bolt in said first position to resist external driving of said bolt toward said second position. 
     
     
       3. The device of claim 1 further comprising manually operative rotative means for mechanically moving said actuator plate means from said first position to said second position. 
     
     
       4. The device of claim 1 wherein said plate means is connected to said bolt for movement of said bolt to said projected locking position upon movement of said plate means to said first position whereby said spring means moves said plate means to said first position upon deenergization of said solenoid means from an actuated condition to provide fail-secure operation. 
     
     
       5. The device of claim 4 wherein, said bolt has a follower pin,   said plate means comprises a plate element slidably mounted within said housing for movement between said first and second positions,   said plate element having a cam slot with said follower pin being slidably mounted within said cam slot, said cam slot being dimensioned and configured to move said bolt to said projected locking position upon movement of said plate element to said first position and to move said bolt to said retracted nonlocking position upon movement of said plate element to said second position.   
     
     
       6. The device of claim 5 wherein said cam slot has a deadlatching portion abutting said follower pin when said plate element is in said first position, said deadlatching portion abutting said follower pin to prevent external driving of said bolt toward said retracted nonlocking position. 
     
     
       7. The device of claim 5 wherein said cam slot comprises first and second legs, said first leg extending diagonally relative to the path of travel of said bolt between said first and second positions and said second leg extending orthogonally relative to said path of travel of said bolt with said first leg moving said bolt to said projected locking position upon movement of said plate element to said first position and said second leg deadlatching said bolt in said projected locking position. 
     
     
       8. The device of claim 1 wherein said plate means is connected to said bolt for movement of said bolt to said retracted nonlocking position upon movement of said plate means to said first position whereby said spring means moves said plate means to said first position upon deenergization of said solenoid means from an actuated condition to provide fail-safe operation. 
     
     
       9. The device of claim 8 wherein, said bolt has a follower pin,   said plate means comprises a plate element slidably mounted within said housing for movement between said first and second positions,   said plate element having a cam slot with said follower pin being slidably mounted within said cam slot, said cam slot being dimensioned and configured to move said bolt to said retracted nonlocking position upon movement of said plate element to said first position and to move said bolt to said projected locking position upon movement of said plate element to said second position.   
     
     
       10. The device of claim 9 wherein said cam slot has a deadlatching portion abutting said follower pin when said plate element is in said second position, said deadlatching portion abutting said follower pin to prevent external driving of said bolt toward said retracted nonlocking position. 
     
     
       11. The device of claim 9 wherein said cam slot comprises first and second legs, said first leg extending diagonally relative to the path of travel of said bolt between said first and second positions and said second leg extending orthogonally relative to said path of travel of said bolt with said first leg moving said bolt to said projected locking position upon movement of said plate element to said second position and said second leg deadlatching said bolt in said projected locking position. 
     
     
       12. The device of claim 1 wherein, said bolt has a follower pin,   said plate means comprises a plate element having a cam slot slidably mounting said follower pin, said cam slot being dimensioned and configured to move said bolt to one of said first and second positions upon movement of said plate element from said first position to said second position and to move said bolt to the other of said first and second positions upon movement of said plate element from said second position to said first position,   said solenoid means being connected to said plate element for actuating said plate from said first to said second position, and   said spring means normally biasing said plate element toward said first position.   
     
     
       13. The device of claim 12 wherein said cam slot is disposed diagonally with respect to the path of travel of said bolt between said first and second positions and extends toward the path of travel of said bolt from said second position to said first position and toward the path of travel of said plate element from said first position to said second position to provide fail-secure operation. 
     
     
       14. The device of claim 13 wherein, said cam slot has first and second ends, said first end being toward the path of travel of said bolt from said second position to said first position, and   said plate element has a deadlatching slot generally orthogonal to the path of travel of said bolt and interconnecting with said first end of said cam slot in obtuse angular orientation with said cam slot to deadlatch said bolt in said first position to resist external driving of s id bolt toward said second position.   
     
     
       15. The device of claim 12 wherein said cam slot is disposed diagonally with respect to the path of travel of said bolt between said first and second positions and extends toward the path of travel of said bolt from said second position to said first position and toward the path of travel of said plate element from said second position to said first position to provide fail-safe operation. 
     
     
       16. The device of claim 15 wherein, said cam slot has first and second ends, said first end being toward the path of travel of said bolt from said second position to said first position, and   said plate element has a deadlatching slot generally orthogonal to the path of travel of said bolt and interconnecting with said first end of said cam slot in obtuse angular orientation with said cam slot to deadlatch said bolt in said first position to resist external driving of said bolt toward said second position.   
     
     
       17. The device of claim 12 wherein said plate element comprises means for selective mounting in said housing in a first fail-secure orientation and alternately in a second fail-safe orientation with said cam slot being disposed diagonally with respect to the path of travel of said bolt between said first and second positions toward the path of travel said bolt from said second position to said first position and: (a) toward the path of travel of said plate element from said first position to said second position when said plate element is mounted in a fail-secure orientation, and   (b) toward the path of travel of said plate element from said second position to said first position when said plate is alternately mounted in a fail-safe orientation.   
     
     
       18. The device of claim 17 wherein, said cam slot has first and second ends, said first end being toward the path of travel of said bolt from said second position to said first position, and   said plate element has a deadlatching slot generally orthogonal to the path of travel of said bolt and interconnecting with said first end of said cam slot in obtuse angular orientation with said cam slot to deadlatch said bolt in said first position to resist external driving of said bolt toward said second position.   
     
     
       19. An electric door lock device comprising an elongated housing for mounting in a door or frame member, a bolt slideably mounted in said housing for movement between a first position and a second position, said first position being a projected, locking position and said second position being a retracted, nonlocking position,   actuator plate means movably mounted in said housing for movement between first and second positions,   means for movably mounting said plate means in a first operational mode and alternatively in a second operational mode,   cam means interconnecting said plate means and said bolt for driving said bolt to one of said first and second positions upon movement of said plate means from said first position to said second position and for driving said bolt to the other of said first and second positions upon movement of said plate means from said second position to said first position,   said cam means being configured and positioned relative to said bolt and said plate means for driving said bolt to said first position upon movement of said plate means to said first position and for driving said bolt to said second position upon movement of said plate means to said second position when said plate means is mounted in said first operational mode and for driving said bolt to said second position upon movement of said plate means to said first position and for driving said bolt to said first position upon movement of said plate means to said second position when said plate means is alternatively mounted in said second operational mode,   a solenoid means for electrically actuating said plate means from said first position to said second position, and   spring means for normally biasing said plate means toward said first position.   
     
     
       20. The device of claim 19, wherein, said cam means comprises a follower pin connected to said bolt and a cam slot in said plate means,   said cam slot operationally receiving said follower pin, said cam slot being dimensioned and configured to drive said bolt to said first position upon movement of said plate means to said first position and to drive said bolt to said second position upon movement of said plate means to said second position, said cam slot having a deadlocking portion to abut said pin when said bolt is in said first position to resist external driving of said bolt toward said second position.   
     
     
       21. The device of claim 20 wherein, said cam slot has first and second ends and is disposed diagonally with respect to the path of travel of said bolt between said first and second positions with said slot extending from said second end to said first end: (a) toward the path of travel of said bolt from said second position to said first position and   (b) toward the path of travel of said plate means from said first position to said second position, and     said locking portion comprises a locking slot extending from said first end of said cam slot in obtuse angular orientation with respect to said cam slot and being generally orthogonal to the path of travel of said bolt.   
     
     
       22. The device of claim 19 comprising manually operative rotative means for mechanically moving said plate means from said first position to said second position for manual retraction of said bolt to said second position. 
     
     
       23. The device of claim 19 wherein, said cam means comprises a follower pin connected to said bolt and a cam slot in said plate means,   said cam slot operationally receiving said follower pin, said cam slot being dimensioned and configured to drive said bolt to said first position upon movement of said plate means to said second position and to drive said bolt to said second position upon movement of said plate means to said first position, said cam slot having a portion to abut said pin when said bolt is in said first position to resist external driving of said bolt toward said second position.   
     
     
       24. The device of claim 23 wherein, said cam slot has first and second ends and is disposed diagonally with respect to the path of travel of said bolt between said first and second positions with said slot extending from said second end to said first end: (a) toward the path of travel of said bolt from said second position to said first position and   (b) toward the path of travel of said plate means from said second position to first position, and     said locking portion comprises a locking slot extending from said first end of said cam slot in obtuse angular orientation with respect to said cam slot and being generally orthogonal to the path of travel of said bolt.   
     
     
       25. The device of claim 19 comprising manually operative rotative means for mechanically moving said plate means from said first position to said second position for manual projection of said bolt to said first position. 
     
     
       26. The device of claim 19 wherein said actuator plate means comprises an actuator plate detachably mounted within said housing for linear movement between said first and second positions. 
     
     
       27. The device of claim 19 wherein said actuator plate means comprises a single actuator plate adapted for reversible mounting within said housing.